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Partial Answer For Ryeno

Ryeno, I have the same problem. I do know where the hex nut goes. See photos attached. I have no idea where the little black clip goes, however, and if I can figure that out I'll have a working mixer. Have you figured out where that clip goes? It is crucial to have that clip in place to control the speed. Without it the mixer runs just fine, but it starts at at about speed four or five and it's not possible to get the lower speeds. Thanks.

What an awesome community! Absolutely nothing out of bounds here. No matter what you're up to, no one seems to bat an eye. More importantly, someone always seems to have some help to offer when you get stuck. Love it!
BTW, I have a "dead" Pro600 sitting on my bench waiting for it's turn. I have a pretty good idea of how to get it sorted, just haven't bothered to dig in yet. Since I have one that's working, I guess the motivation hasn't quite hit yet.

I really could use some help here.....

Back in 2005, I inherited my Grandmother's Kitchenaid K5-a that she bought new in late 60's (Certified Pastry Chef)

well, I used it many time over the last few years, and the last 6 times I used it... the motor casing was getting hot.

I'm pretty resourceful and have a pretty fair mechanical ability. (If you can replace internal parts in an iPhone, you got it made)

so, I sent the K5-a to the workbench (aka kitchen table) and tore into it.

Kept my screws/parts separated and photographed with iPhone above.
Moved everything to the workbench in garage..... Researched and ordered the parts needed. Stator/drive, Motor Field, brushes, new grounded power cord.

Then my little old world fell apart

Was hospitalized with Pancreatitis for several days, and in the meantime "someone" messed with my workbench. (I won't point fingers...I'm some dumb, not plumb dumb)

Grandma's K5-a got placed on the back burner.... Since then, I've compared my pics with the parts and all is good.

The trouble I have is the new parts have to be retrofitted

I really need to find schematics for this thing, it's an older model (better model) than what's being offered out there, along with it being Grandma's.... I gotta get this thing going and back to baking bread.

If the parts had been a direct replacement.... the stator motor cooling fan would have been same size, the wires of the motor field would have clipped right back onto the brush holders. and numerous other differences.
I did notice the new parts were shipped in boxes that said Genuine Whirlpool Parts. Good or bad, I cannot say.

And too, when I popped off the back cover I had the little black clip bounce onto the table. (never seeing where it came from)